J2ME 垃圾滚动条

 public static void drawScroll_Bar(int top_y, int scroolHeight, int sumNum,
   int nowNum, int drawRow, Graphics g) {
  int top_x = MainCanvas.CANVASWIDTH - 5;
  // 绘制背景
  g.setColor(0xcccccc);
  g.fillRect(top_x, top_y, 5, scroolHeight);
  g.setColor(0);
  if (nowNum + drawRow >= sumNum) {
   g.fillRect(top_x, top_y + scroolHeight - 5, 5, 5);
  } else if (nowNum == 0) {
   g.fillRect(top_x, top_y, 5, 5);
  } else {
   g.fillRect(top_x, top_y
     + (((nowNum + drawRow/2) * 1000 / sumNum) * scroolHeight)
     / 1000 - 5, 5, 5);
  }
 }